U.S. law enforcement has disrupted a second major Chinese hacking group nicknamed "Flax Typhoon" and wrested thousands of compromised devices from its grasp, FBI Director Christopher Wray said on Wednesday.

The Flax Typhoon campaign used malware it put on cameras, video recorders and home and office routers, to create a massive network of infected computers and commit cybercrimes, the agency says.

"The government’s malware disabling commands, which interacted with the malware’s native functionality, were extensively tested prior to the operation," according to the DOJ.